Reducer for concrete mixer

Abstract

The invention relates to a speed reducer for a concrete mixing main machine. The speed reducer comprises an upper casing, a lower casing, a planet carrier assembly, an inner gear and a gear shaft, wherein teeth are arranged at one end of the gear shaft in the peripheral direction, the gear shaft extends into the planet carrier assembly and meshed with all planet gears in the planet carrier assembly, the planet gears of the planet carrier assembly are meshed with the inner gear, the planet carrier assembly is arranged between the upper casing and the lower casing, and the planet carrier assembly is of a single-end floating type supporting structure to achieve transmission. Due to the facts that the planet carrier assembly is of the single-end floating type supporting structure to achieve transmission and the two ends are not supported by a bearing, the coaxiality requirements for bearing holes needn't to be taken into consideration. Thus, the processing efficiency is improved. Meanwhile, the single-end floating type supporting structure can balance load between all planet gears in the planet carrier assembly, the gear side gap between the planet gears and the inner gear can be adjusted by self according to radial stress on the planet gears, the rotation noise is reduced, and the stability and the reliability of transmission are improved.

Description

technical field [0001] The invention relates to the field of engineering machinery, in particular to a reducer for a concrete mixing main engine. Background technique [0002] Concrete mixing main engine is a kind of construction machinery equipment that mixes cement, gravel, sand, etc. into concrete. The reducer used in it is mainly composed of shell, planetary frame assembly, planetary frame support bearing and screw umbrella assembly. like figure 1 Shown is an exploded schematic diagram of the internal structure of an existing reducer. The speed reducer includes three sections of housing, which are the upper housing a8, the middle housing a6 and the lower housing a1 respectively. The gear shaft a7 is installed in the upper housing a8, and the gear shaft a7 is connected by the upper housing a8 and the middle housing a6. The two axial ends of the planetary carrier assembly a3 are respectively supported by the self-aligning roller bearing a2 and the deep groove ball bearin...

AI Technical Summary

Problems solved by technology

[0003] exist figure 1 In the structure of the reducer shown, the planet carrier adopts the form of fixed support at both ends, which requires high machining accuracy for the reducer housing. If the housing is not processed properly, it is easy to cause the backlash between the planetary gear and the internal gear. Uneven, which in turn will lead to uneven load transmission of each planetary gear, causing premature wear of the planetary gear with small backlash, reducing the stability and reliability of the transmission

In addition, since both ends of the planet carrier are supported by bearings, the coaxiality of the two bearing holes is required to be high, which reduces the processing efficiency

[0004] At the same time, the inside of the reducer requires a large space, so it occupies more shells, resulting in more split surfaces of the reducer, which also increases the probability of gear oil leakage

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